/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */

/*
 * Created on Apr 9, 2003
 *
 * Clones a JMeterTreeNode
 */
package org.apache.jmeter.gui.action;

import java.awt.event.ActionEvent;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Set;

import org.apache.jmeter.gui.GuiPackage;
import org.apache.jmeter.gui.tree.JMeterTreeListener;
import org.apache.jmeter.gui.tree.JMeterTreeNode;
import org.apache.jmeter.testelement.TestElement;

/**
 * Implements the Copy menu command
 */
public class Copy extends AbstractAction {
	private static JMeterTreeNode copiedNode = null;

	private static JMeterTreeNode copiedNodes[] = null;

	private static final HashSet commands = new HashSet();
    
	static {
		commands.add(ActionNames.COPY);
	}

	/*
	 * @see org.apache.jmeter.gui.action.Command#getActionNames()
	 */
	public Set getActionNames() {
		return commands;
	}

	public void doAction(ActionEvent e) {
		JMeterTreeListener treeListener = GuiPackage.getInstance().getTreeListener();
		JMeterTreeNode[] nodes = treeListener.getSelectedNodes();
		setCopiedNodes(nodes);
	}

	public static JMeterTreeNode[] getCopiedNodes() {
		for (int i = 0; i < copiedNodes.length; i++) {
			if (copiedNodes[i] == null) {
				return null;
			}
		}
		return cloneTreeNodes(copiedNodes);
	}

	public static JMeterTreeNode getCopiedNode() {
		if (copiedNode == null) {
			return null;
		}
		return cloneTreeNode(copiedNode);
	}

	public static void setCopiedNode(JMeterTreeNode node) {
		copiedNode = cloneTreeNode(node);
	}

	public static JMeterTreeNode cloneTreeNode(JMeterTreeNode node) {
		JMeterTreeNode treeNode = (JMeterTreeNode) node.clone();
		treeNode.setUserObject(((TestElement) node.getUserObject()).clone());
		cloneChildren(treeNode, node);
		return treeNode;
	}

	public static void setCopiedNodes(JMeterTreeNode nodes[]) {
		copiedNodes = new JMeterTreeNode[nodes.length];
		for (int i = 0; i < nodes.length; i++) {
			copiedNodes[i] = cloneTreeNode(nodes[i]);
		}
	}

	public static JMeterTreeNode[] cloneTreeNodes(JMeterTreeNode nodes[]) {
		JMeterTreeNode treeNodes[] = new JMeterTreeNode[nodes.length];
		for (int i = 0; i < nodes.length; i++) {
			treeNodes[i] = cloneTreeNode(nodes[i]);
		}
		return treeNodes;
	}

	private static void cloneChildren(JMeterTreeNode to, JMeterTreeNode from) {
		Enumeration enumFrom = from.children();
		while (enumFrom.hasMoreElements()) {
			JMeterTreeNode child = (JMeterTreeNode) enumFrom.nextElement();
			JMeterTreeNode childClone = (JMeterTreeNode) child.clone();
			childClone.setUserObject(((TestElement) child.getUserObject()).clone());
			to.add(childClone);
			cloneChildren((JMeterTreeNode) to.getLastChild(), child);
		}
	}
}